S79.119K Salter-Harris Type I physeal fracture of lower end of unspecified femur, subsequent encounter for fracture with nonunion

Name of the Condition

Salter-Harris Type I physeal fracture of lower end of unspecified femur, subsequent encounter for fracture with nonunion

Summary

A Salter-Harris Type I physeal fracture of the lower end of the unspecified femur is an injury involving the growth plate (physis) at the distal femur, typically occurring in children or adolescents. This fracture disrupts the physis, which is the area of developing bone responsible for longitudinal growth. The injury specifically involves a separation of the growth plate from the metaphysis without associated fracture of the epiphysis or metaphysis, as defined by the Salter-Harris classification system. The "subsequent encounter" and "with nonunion" descriptors indicate this is a follow-up visit for a fracture that has failed to heal properly.

Causes

Salter-Harris Type I physeal fractures of the lower femur are usually caused by acute trauma, such as falls, sports-related injuries, or direct blows to the knee or thigh. The force transmitted across the growth plate can cause it to separate from the adjacent bone. In some cases, repetitive stress or overuse may contribute to the injury, particularly in active children or adolescents. Nonunion may result from inadequate immobilization, poor blood supply, or excessive movement at the fracture site during healing.

Risk Factors

• Age: Most common in children and adolescents, as growth plates are weaker than surrounding bone.
• Activity level: Participation in high-impact sports or activities with a risk of falls (e.g., gymnastics, soccer, skateboarding).
• Growth spurts: Periods of rapid growth may temporarily weaken the physis, increasing susceptibility to injury.
• Anatomical factors: Variations in bone structure or alignment may predispose to injury.
• Delayed or inadequate treatment: Improper immobilization or insufficient follow-up care can increase the risk of nonunion.

Symptoms

• Persistent pain at the fracture site, often worsening with activity.
• Swelling and tenderness around the knee or thigh.
• Limited range of motion in the affected leg.
• Visible deformity or abnormal alignment in severe cases.
• Difficulty bearing weight or walking.

Diagnosis

Diagnosis typically involves a physical examination to assess pain, swelling, and range of motion. Imaging studies, such as X-rays, are used to confirm the fracture and evaluate for nonunion. Additional tests, like MRI or CT scans, may be ordered to assess the extent of the injury and rule out other complications. The healthcare provider will also review the patient’s medical history and previous treatment to determine the cause of nonunion.

Treatment Options

Treatment focuses on promoting healing and restoring function. Options may include:

• Immobilization with a cast or brace to stabilize the fracture.
• Surgical intervention, such as internal fixation, to realign and stabilize the bone.
• Bone grafting to stimulate healing in cases of nonunion.
• Physical therapy to improve strength and mobility once healing progresses.
• Pain management with medications or other modalities.

Prognosis and Follow-Up

Prognosis depends on the severity of the nonunion and the effectiveness of treatment. With proper care, many patients achieve full recovery, though some may experience long-term limitations in mobility or growth. Regular follow-up appointments are essential to monitor healing and adjust treatment as needed. Long-term outcomes may include residual stiffness or growth disturbances in rare cases.

Complications

• Chronic pain or discomfort.
• Limited range of motion or functional impairment.
• Growth disturbances, such as limb length discrepancy.
• Arthritis or joint degeneration over time.
• Need for additional surgeries if nonunion persists.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Use protective gear during sports or activities with fall risks.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Follow post-treatment guidelines for immobilization and activity restrictions.
• Attend all scheduled follow-up appointments to monitor healing.

When to Seek Professional Help

Seek immediate medical attention if you experience:

• Severe or worsening pain.
• Increased swelling, redness, or warmth at the injury site.
• Inability to bear weight or move the leg.
• Signs of infection, such as fever or pus drainage.
• New or worsening deformity.

Tips for Medical Coders

When coding for S79.119K, ensure documentation supports the "subsequent encounter" and "with nonunion" descriptors. Verify that the fracture is classified as Salter-Harris Type I and involves the lower end of the unspecified femur. Document the encounter type (e.g., follow-up visit) and confirm the presence of nonunion to justify the code. Include details about prior treatments or interventions that may have contributed to the nonunion.